Knapsack



FIG. 1 is a front elevational view of a knapsack showing my new design;

FIG. 2 is a front elevational view thereof; shown without wearer;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken line showing of wearer is for illustrative purpose only andforms no part of the claimed design; any portions of the sides of theknapsack which are not disclosed are disclaimed.

The ornamental design for a knapsack, as shown and described. 